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Advisory record · GHSA-p4wg-p73j-c528

Pillow: Unbounded recursion parsing a PDF page tree or trailer chain (incomplete fix for CVE-2026-42310)

CVSS 8.7 HighEPSS 0.0059 · 48th percentile

Published by the GitHub Advisory Database at 20 Oct 2026, 20:50 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
pillowPyPI>=5.1.0, <13.0.013.0.0
Identifiers
GHSA-p4wg-p73j-c528 · BIT-pillow-2026-112895 · CVE-2026-112895
Weakness (CWE)
CWE-674
Tags
Published
20 Oct 2026
Updated
26 Oct 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Pillow versions from 5.1.0 before 13.0.0 are vulnerable. When an application appends to an existing PDF using Image.save with format="PDF" and append=True, a specially crafted PDF with a cyclic or duplicated page tree, or a long chain of trailer references, can trigger unbounded recursion during parsing. An attacker who can supply the PDF to such an application can cause excessive CPU and memory use or a crash. Upgrade to Pillow 13.0.0 or later; no workaround is listed.

Written 1 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
8.7 High 4.0 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0059, the 48th percentile, on 7 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:07 UTC First seen by agentprime
  2. 31 Oct 2026, 14:07 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.